Check the listing for details. Comfort Zone Single & Multi-Cat Calming Kit Plug-In Defuser & Refill 3773. Condition: New. Listed at 14.75 USD. The Comfort Zone Single & Multi-Cat Calming Kit Plug-In Diffuser & Refill 3773 is a product designed to help calm and reduce stress in cats. Made by the brand comfort zone, this plug-in diffuser releases pheromones to create a calming environment for pets. The kit includes a diffuser unit and refill bottles, providing a convenient and effective solution for pet owners looking to create a soothing atmosphere for their feline companions. Made in the United States, this product is specially formulated to help cats feel relaxed and comfortable in various situations.